Differentiating elevator car door and landing door operating problems

a technology for elevators and landing doors, applied in the direction of computers, instruments, elevators, etc., can solve the problems of prohibitively expensive elevator systems and the most complex mechanisms

Inactive Publication Date: 2002-08-27
OTIS ELEVATOR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Objects of the invention include provision of an improved methodology for discriminating between elevator car door problems and elevator landing door problems; an improved diagnostic methodology for detecting the source of elevator door operational problems; reducing the service time required for elevator door system service calls; and reducing elevator out-of-service time as a function of elevator door system problems.

Problems solved by technology

One of the most complex mechanisms of an elevator is the door system, since it consists of a large number of mechanical and electrical components working together, and since it undergoes a very large number of operational cycles per unit of time.
It would be easy to separate elevator car door problems from elevator landing door problems if the landing door was operated independently; however, this would require each landing door to have its own door motor, position encoder, and motion control process loop.
Such would be prohibitively expensive in any elevator system.

Method used

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  • Differentiating elevator car door and landing door operating problems
  • Differentiating elevator car door and landing door operating problems
  • Differentiating elevator car door and landing door operating problems

Examples

Experimental program
Comparison scheme
Effect test

example 1

Prior Art:

Consider an elevator with 10 floors where f[i] is as follows (1=a flag; 0=no flag):

f[0]=1 f[1]=0 f[2]=0 f[3]=1 f[4]=1

f[5]=0 f[6]=0 f[8]=0 f[8]=1 f[9]=0

A problem has been identified at floors 0, 3, 4, and 8. No problem has been identified in the other floors. Since the problem occurs at at least 40% of the landings, the car door will be identified as the root of the problem in the prior art system.

According to the invention, in addition to the number of flags in the array f[i], the traffic pattern of the elevator being monitored is taken into account. A flag at a particular floor will only be as important as the contribution of that floor to the total number of operations being monitored. Therefore, this invention uses, besides the flag array f[i], another array with the number of runs to each floor monitored by landing, n[i], where i=0-F. Note that n[i] contains the number of runs per floor with at least one door operation rather than the number of door operations; this is...

example 2

Using the same f[i] as in example 1:

f[0]=1 f[1]=0 f[2]=0 f[3]=1 f[4]=1

f[5]=0 f[6]=0 f[7]=0 f[8]=1 f[9]=0

Suppose that the traffic pattern is as follows:

There is a flag in four floors and the number of runs to (initial door operations at) those floors is 77% of the total number of runs; therefore, we are confident enough to say that the problem is in the car door.

Suppose that the traffic pattern is as follows:

n[0]=100 n[1]=1,000 n[2]=100 n[3]=200 n[4]=150

n[5]=75 n[6]=70 n[7]=80 n[8]=100 n[9]=60

There still is a flag in four floors, but now the number of door operations at those floors is just 28% of the total number of runs. This means that the other 68% of the runs did not have any problem, so pointing to the car door is probably wrong. This invention points to the landing door in floors 0, 3, 4, and 8, instead of pointing to the car door.

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Abstract

Signal processing and diagnostic routines (19) of elevator controllers (9-12) count the total number of runs to landings (O-F) of elevators (4-7) along with the number of runs to landings at which a value of a parameter of an elevator door condition or event is notable, (e.g., too high or too low). If any particular parameter is notable at more than one landing, and the ratio of (a) number of runs to landing at which said particular parameter is notable to (b) the total number of runs to landings exceeds a predetermined threshold, the problem is registered as a car door problem; otherwise, the problem is registered as a landing door problem at each landing where the value of the particular parameter is notable.

Description

This invention relates to a method for differentiating between elevator car door operation problems and landing door operation problems, based upon the number of runs to a landing at which the problem is sensed.Known elevator diagnostic systems monitor a limited set of signals from the elevator system itself, such as door switches, door open limit switch, final limit switches, etc., and / or from external sensors such as temperature, vibration, noise, etc. These signals are analyzed and the combination and sequence of them is used to find those problems that require human intervention or a different mode of operation. A good elevator diagnostic system has to be able to detect the failures and point to the part or parts that are the origin of the failures.One of the most complex mechanisms of an elevator is the door system, since it consists of a large number of mechanical and electrical components working together, and since it undergoes a very large number of operational cycles per u...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B66B5/00B66B13/14B66B3/00B66B5/02
CPCB66B13/143B66B5/0031
Inventor LENCE BARREIRO, JUAN A.LIU, JUNMOON, CHOUHWAN
Owner OTIS ELEVATOR CO
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